They were connected by fills at the time the Overseas Railroad was built.

The construction of the Overseas Railroad required many engineering innovations as well as vast amounts of labor and monetary resources.

Prior to the building of the Overseas Railroad, there were two separate islands there, known as the Umbrella Keys.

However, the Overseas Railroad through the Keys was severely damaged during the 1935 Labor Day hurricane and service never returned.

It was originally built by Henry Flagler as part of the Overseas Railroad which was completed in 1912.

It is an abandoned rock quarry that was used for nearby road fills and Henry Flagler's Overseas Railroad.

It initially served a housing for some of the employees who were building the Overseas Railroad to Key West.

The fishing camp was destroyed by the Labor Day Hurricane of 1935, as was the Overseas Railroad.

WPA workers were building a new highway parallel to the Overseas Railroad.

It was a former quarry used by Henry Flagler in the early 1900s to help his building of the Overseas Railroad.